<?php

/*
	Question2Answer (c) Gideon Greenspan

	http://www.question2answer.org/

	
	File: qa-include/qa-ajax-asktitle.php
	Version: See define()s at top of qa-include/qa-base.php
	Description: Server-side response to Ajax request based on ask a question title


	This program is free software; you can redistribute it and/or
	modify it under the terms of the GNU General Public License
	as published by the Free Software Foundation; either version 2
	of the License, or (at your option) any later version.
	
	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU General Public License for more details.

	More about this license: http://www.question2answer.org/license.php
*/

require_once QA_INCLUDE_DIR . 'qa-db-selects.php';
require_once QA_INCLUDE_DIR . 'qa-util-string.php';


//	Collect the information we need from the database

$intitle = qa_post_text('title');
$doaskcheck = qa_opt('do_ask_check_qs');
$doexampletags = qa_using_tags() && qa_opt('do_example_tags');

if ($doaskcheck || $doexampletags) {
    $countqs = max($doexampletags ? QA_DB_RETRIEVE_ASK_TAG_QS : 0, $doaskcheck ? qa_opt('page_size_ask_check_qs') : 0);

    $relatedquestions = qa_db_select_with_pending(
        qa_db_search_posts_selectspec(null, qa_string_to_words($intitle), null, null, null, null, 0, false, $countqs)
    );
}


//	Collect example tags if appropriate

if ($doexampletags) {
    require_once QA_INCLUDE_DIR . 'qa-app-format.php';

    $tagweight = array();
    foreach ($relatedquestions as $question) {
        $tags = qa_tagstring_to_tags($question['tags']);
        foreach ($tags as $tag)
            @$tagweight[$tag] += exp($question['score']);
    }

    arsort($tagweight, SORT_NUMERIC);

    $exampletags = array();

    $minweight = exp(qa_match_to_min_score(qa_opt('match_example_tags')));
    $maxcount = qa_opt('page_size_ask_tags');

    foreach ($tagweight as $tag => $weight) {
        if ($weight < $minweight)
            break;

        $exampletags[] = $tag;
        if (count($exampletags) >= $maxcount)
            break;
    }

} else
    $exampletags = array();


//	Output the response header and example tags

echo "QA_AJAX_RESPONSE\n1\n";

echo strtr(qa_html(implode(',', $exampletags)), "\r\n", '  ') . "\n";


//	Collect and output the list of related questions

if ($doaskcheck) {
    require_once QA_INCLUDE_DIR . 'qa-app-format.php';

    $count = 0;
    $minscore = qa_match_to_min_score(qa_opt('match_ask_check_qs'));
    $maxcount = qa_opt('page_size_ask_check_qs');

    foreach ($relatedquestions as $question) {
        if ($question['score'] < $minscore)
            break;

        if (!$count)
            echo qa_lang_html('question/ask_same_q') . '<br/>';

        echo strtr(
            '<a href="' . qa_q_path_html($question['postid'], $question['title']) . '" target="_blank">' . qa_html($question['title']) . '</a><br/>',
            "\r\n", '  '
        ) . "\n";

        if ((++$count) >= $maxcount)
            break;
    }
}


/*
	Omit PHP closing tag to help avoid accidental output
*/